Justin Mathecowitsch

Building mobile apps people open everyday. currently building @playchromies

Previously: Voodoo, Sorare

[Justin Mathecowitsch @t3comah]

👉 https://t.co/krTU7DT05V

[Justin Mathecowitsch @t3comah]

day 12 of building @playchromies

very excited to organise a color hunt this Sunday. Registration is free, you only have to show up with a charged phone/camera.

📍Paris, Montmartre
📆 Sunday, 5:30 CET
🍻 at the end!

Register for free though Luma. Link in comment

[Justin Mathecowitsch @t3comah]

@tulleb @playchromies Claude design 😌 (JSX)

[Justin Mathecowitsch @t3comah]

day 11 of building @playchromies to help people stop doomscrolling and go outside.

Just submitted a new app version with the crew feature fully implemented as a V1.

Can’t wait to play it!!

[Justin Mathecowitsch @t3comah]

day 10 of building @playchromies, the color-hunting game

Two days ago I started the biggest growth feature yet. Here’s how it’s shaping up.

Crews. Team up with friends, share a mission, earn points and build a streak together.

Chromies has been a solo ritual so far. Soon it’ll be one you can share.

The hardest thing in any walking-the-world app is keeping people consistent. Friends solve that better than any notification ever will.

Shipping this week.

[Justin Mathecowitsch @t3comah]

psg 🔵

[Justin Mathecowitsch @t3comah]

day 9 of building @playchromies

PSG or Arsenal?

[Justin Mathecowitsch @t3comah]

cheer for your team

https://t.co/FRy6LJHzLb

[Justin Mathecowitsch @t3comah]

day 8 of building @playchromies, the app that turns your phone into a reason to look up

Got this message from a power user this afternoon. It’s the whole thesis of Chromies in two sentences.

Started the biggest growth feature today, the one that gives every user a real reason to bring friends along.

More soon.

[Justin Mathecowitsch @t3comah]

day 7 of building @playchromies, one colour a day, your whole city seen anew

Somewhere right now, someone is chasing pumpkin down a street they've walked a hundred times. That's the whole point.

Shipped two things to lean into that:

• a reworked Snap tab, more social and tighter to the app's storytelling
• leaderboard previews on every profile, so you can see how your friends are ranking at a glance

Video below.

[Justin Mathecowitsch @t3comah]

day 6 of building @playchromies, the first colour-hunting game

Shipped a major upgrade to the colour identifier today.

The fix didn’t come from me. It came from @Bptstmlgt (49 colours captured), sitting in the top division, and apparently keeping a running list of every edge case the algo got wrong.

He sent it over. We rebuilt against it. Live tonight.

This is day 6 and the community is already shaping the product.

[Justin Mathecowitsch @t3comah]

@KiteSprint great taste!

[Justin Mathecowitsch @t3comah]

@yahyavision

[Justin Mathecowitsch @t3comah]

shipping one new version a day keeps the doctor away ⛴️

[Justin Mathecowitsch @t3comah]

https://t.co/DGVyB8Gutw

[Justin Mathecowitsch @t3comah]

day 5 of building @playchromies the colour-hunting photography game.

I watched @Sorare go from a niche NFT experiment to the biggest fantasy football game on the planet.

The product in its early days moved at a pace no roadmap could capture.

The community wasn’t loyal: they were OBSESSED.

The engine for both was the same: the Discord.

Not a marketing channel. The place where the company actually lived.
Founders and early employees (👋@ni2las @dansorare @bruhagan ) inside it daily. Ideas surfaced and tested before they ever became features. Bugs caught and fixed within hours.

That’s the playbook I keep coming back to 👇

Opening a Discord for @playchromies today. Come in early!

Link in comments.

[Justin Mathecowitsch @t3comah]

@danieldwalton @playchromies thanks for the support!

[Justin Mathecowitsch @t3comah]

day 3 of building @playchromies, the Pokémon Go game but for colors 🎨

Spent part of the day rethinking onboarding.

Current version let new users skip sign-up entirely. Snap a first photo, start a collection, and only hit a sign-up wall when they wanted social features.

In theory, this is best practice: zero friction, instant magic moment.

But it felt wrong. The first photo carried no weight because they hadn't committed to anything yet.

So I flipped it. Every new user now goes through a beautiful branded landing screen first. Sign up, then start hunting colors.

Used Claude Design to one-shot this screen and animations, with handoff instructions clean enough that Claude Code dropped it into SwiftUI without back-and-forth.

The improvement @claudeai has shipped on Claide Design over the last month is genuinely wild.

New version submitting tonight.

Shipping one every day

[Justin Mathecowitsch @t3comah]

@viquinge @playchromies it is! see you there 👋

https://t.co/FRy6LJHzLb

[Justin Mathecowitsch @t3comah]

@flyosity @treeo great design!!

[Justin Mathecowitsch @t3comah]

@hii_mohit @marclou Brilliant if that works!